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Prove that the order of complete graph on n ≥ 2 vertices is (n−1)n 2 by......

Prove that the order of complete graph on n ≥ 2 vertices is (n−1)n 2 by...

a) Using theorem Ʃv∈V = d(v) = 2|E|.

b) Using induction on the number of vertices, n for n ≥ 2.

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